SAAT (English)

Chemistry: sample 11

These questions are ETEC/Qiyas's own officially published trial-exam questions, shown here with attribution. They are not sold and are not part of Smart Advanced Network for Education, Development & Achievement's original question bank.

Directions

Read the following questions. Choose the right answer.

There is only ONE correct answer to each question.

In a multi-electron atom, which of the following sublevels has the lowest energy?

Show answer

Correct answer: A. 4s

Why

By the Aufbau (n+l) ordering, 4s (n+l=4) fills before 3d (n+l=5) in multi-electron atoms, so 4s has the lower energy of these.

Source: The Standardized Academic Achievement Test (SAAT) for the Science Track Trial Test (ETEC official) Open the official document

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